Electric condenser



Fell 7, 1928.

P. B. VALLE ELECTRIC coNDENsER Filed NOV 14, 1925 l I 1 l l I 1 1 f m, Il

Patented Feb. 7, 1928.

UNITED STATES PATENT OFFICE.

PAUL B. VALLE, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO TEE ACME WIRE CO., OF NEW HAVEN, CONNECTICUT, A CORPORATICN.

l ELECTRIC CONDENSER.

Application led November 14, 1925. Serial No. 68,988.

. Fig. 1 is a view in elevation of a multiplecapacity, electric condenser constructed 1n accordance with my invention.

Fig. 2 is a diagrammatic, transverse, sec- 5 tional view thereof on an enlarged scale.

My invention Irelates to an improvement in that class of electric lcondensers `such as are employed in situations where the several circuits'in which the condensers are located l0 are not in phase, the object being to provi-de a compact and eiicient, multiple-capacity condenser constructed with particular reference, to providing, in a single structure, a plurality of capacities at a greatly reduced cost of manufacture and superior convenience in use.

With these ends in viewf my invention consists in a multiple-capacity, electric condenser characterized by having certain arrangements of elements as will be hereinafter described and pointed out in the claims.

For the illustration of my invention, I have shown ajmultiple-capacity condenser having two pairs of conducting foils, butthe number-of pairs of such foils may be increased .according to the number of separate capacities desired.

In the.multiplecapacity condenser shown,

the inner condenser consists Yof conducting foils and 6 separated by two strips 7 and Sof suitable paper-insulation. These foils and strips are spirally wound, so as to form a virtually solid convolute mass. In Fig. 2, which is diagrammatic in its character, the said; foils are given substantially oneand one-half convolutions. A shield `9, in vthe form of a thin sheet of metal, is now inserted between the insulating strips 7 and 8, the inner end of the shield starting some distance beyond (as at the point 10, Fig.2) the outer ends ofthe foils 5 and 6, so as to avoid any chance of electrical connection between the shield and the foils in question. The outer end 11 of the shieldis correspondingly carriedbeyond its inner end 10, so as to en velop the same, as shown at the right-hand end of Fig. 2, wherebythe inner pair of foils is' electrically isolate-d from the superimposed outer pair of conducting foils 12 an `13, the inner ends of which are started 'for 1n turning out suiiciently beyond the outer end 11 of the shield t0 guard against any electrical connection between them. The said inner ends of the outer conducting foils l2 and 13 are inserted between the same two strips of paper insulation 7 and 8 and the winding `continued as before for substantially one convolution, the sheetsof insulation 7 and 8 now carried beyond the outer` ends of the v outer pair of foils, so as to provide an outer o0 coverin therefor. On account of the greater lengt of the foils 5 and 6 over the length of the foils 12 and 13, the outer condenser formed thereby will be of somewhat lesser capacity than the inner condenser, or the order may be reversed and the inner condenser made of the lesser capacity. In the same manner, the condenser may be built up to any required number of capacities by inserting extra pairs of foils-and a shield between each pair, the precaution always being vtaken to prevent the shields from contacting with any of the foils. For convenience of use, the foils 5 and 6 are provided with terminals 14 and l5 and the foils 12 and 13 with terminals 16 and 17.

By the common method of winding, my improved multiple-capacity condensery may be produced with reater econom of time and'labor, since onIyone set-up is called \.a condenser having a plurality of capacities.

It will be readily understood by any one familiar with the use of such condensers that the condenser comprising foils 5 and 6 may be used in a circuit of entirely different phase from the condenser comprising the foils 12 and 13, this being made possible by the use ofthe shield 9. However, the presanee of the shield does not prevent the use of the condenser in circuits which are in phase.

I claim:

A convolute multiple-capacity electric condenser having a pair of conducting foils, two strips of insulating material separating-the same, a shieldof conducting foil inserted between the two strips of insulation beyond the points where the said foils end,'anda second pair of conducting foils inserted be- 100 sulated from each other and whereby the respective pairs of conducting foils are electrostatically shielded from each other.

In testimony whereof, I have signed this specification. l

PAUL B. VALLE'. 

